Photo by: Andy King
ASSOCIATED PRESS Minnesota Vikings quarterback Brett Favre (4) has the ball knocked loose as he fumbles during the second half of an NFL football game Sunday, Sept. 19, 2010, in Minneapolis. The Miami Dolphins recovered in the end zone for a touchdown.

Robert Mueller’s special counsel investigation into Russian meddling in the 2016 election has cost $6.7 million during the first four and a half months of the probe. Click to see past independent counsel investigations guilty of racking up high bills.